Spaceships - All Buildable Parts

A closer look at the slide in the recent direct that breaks down all ship parts that can be used to construct a spaceship.

I think most of them are self-explanatory, but I wonder what the distinction between grav drives, engines, and reactors is, and what exactly fuel tanks affect.

I also wonder how cargo capacity manifests, and if there's cargo that we can't carry on our person but only on our ships. It would be a bit silly if we could carry tons of ore in our spacesuits to our ship, so having some way to transfer directly from outpost resource collectors to our ships would make sense to me.